Update AppEvent.php

修复没有 ToUserName 问题

Author: qq1060656096

src/Events/AppEvent.php

@@ -94,7 +94,10 @@ public function processEventCallback($token, $encodingAesKey) {
 
         $eventRawArr    = XmlHelper::xmlToArray($eventRawData);
 
-        $corpId         = $eventRawArr['ToUserName'];
+        $corpId = null;
+        if (isset($eventRawArr['ToUserName'])) {
+            $corpId         = $eventRawArr['ToUserName'];
+        }
         $eventParams    = new EventParams();
         $eventParams->msg_signature = isset($_GET['msg_signature']) ? $_GET['msg_signature'] : '';
         $eventParams->timestamp = $_GET['timestamp'];
@@ -169,4 +172,4 @@ public function callEventReceive(EventReceiveInterface $eventReceive, $eventArr)
         return new AppEventResult(AppEventResult::TYPE_EVENT, $this->getProcessEventSuccessResult(), $result);
     }
 
-}
+}